/*
 * Copyright (c) 2012 Robert Burrell Donkin robertburrelldonkin.name
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
 * and associated documentation files (the "Software"), to deal in the Software without restriction, 
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or 
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */
package sekhmet.reader;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Random;

public class Prompts {

	private final Random random;
	private final List<String> prompts;
	private final int size;
	
	private int count;
	
	private SelectionMethod method = SelectionMethod.RANDOM;
	
	public Prompts(final Collection<String> prompts) {
		this.prompts = Collections.unmodifiableList(new ArrayList<String>(prompts));
		random = new Random();
		this.size = prompts.size();
		count = 0;
	}

	public SelectionMethod getMethod() {
		return method;
	}

	public void setMethod(SelectionMethod method) {
		this.method = method;
	}
	
	public String next() {
		switch (this.method) {
			case RANDOM:
				return prompts.get(random.nextInt(prompts.size()));
			case SEQUENTIAL:
				return prompts.get(count++ % size);
			default:
				throw new IllegalArgumentException("Unsupported");
		}
	}

	public int getSize() {
		return size;
	}
}
